The first media previews have begun and while an embargo keeps most press from writing about it that hasn’t stopped the UK's Sun which has already declared parts of AVATAR to be “absolutely mind-blowing.” The Guardian honors the embargo but reports on the 3D effects (they won’t make you nauseous). Alex Billington from FirstShowing said over Twitter: “James Cameron is a freakin’ genius! I can’t say much but wow, I loved it. Avatar was phenomenal, pretty much blew me away.” Ed Douglas from ComingSoon says, “I’ll take my chances with Fox legal…. Avatar was amazing, I loved it!” Slashfilm has more Twitter reactions here, and The Hollywood Reporter gushes that James Cameron is “King of the world” and “movie magic is back!”

Update: Fox lifted the press embargo after some very positive reviews leaked. Look for a wave of reviews in the next few days.